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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '508eeb1c5ac404a7c34c60bd44c2b7f3ef11fb81c909c33562857f41d6650adc' 
  AND token = 'nYvTbS3nnmzlsaNsJbGC+O0PNV0K6lXdVOhbUcr8TH8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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