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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d1f5c252ea54a1edfad9a817e78a71fef6d28a6e0dcc9ae6fbe7d1193194d6' 
  AND token = 'FIkarP/QnK7kG3PdwDC5Xm6gsurGih4zshDrYDspjlc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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