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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebb89a2e8146df66d1c2f5ffec453dd00cf0bc29082f8bb4def9e7a37e2a111d' 
  AND token = 'qqcPPL4yBfp6Y9qkuqlQ3bRQrrKTA/3ZO6DhArk6+Z0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}