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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feb520f4083145767ba5da904a70f77fa7e5d1856f9100eee573ebdfb7d34d6d' 
  AND token = 'XhBIggqgFTjkeFUaPOsVgv9YaMSLisUIlT4lA/W5HH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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