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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '478c95df23ee02e6e132143efd29d0f48a043eb72430f075329286afe543d0f3' 
  AND token = '7EI2AA0yY3a8rTtm09nL3yKhpMxulDqD3Tb/aLZEaIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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