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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b206bb04519a7608486e93726cd6a476f9f7f988c88469fe26e0b1bf8435d20b' 
  AND token = 'FP1cyJlyJ1EKPyRFfNQGMVfBZP0bwR8SvKE/zeQR2Jk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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