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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f88fd43fa0fa9ce7a232531def11f3c2f7ab46e6cb71bb72e662a8ed27140ba' 
  AND token = 'r0LIbRLzTRsyzu5uqcCvjJfi23PedCPpK0S/MXxMNhQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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