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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79112499d6cb84d3a9caef13c8ba089b8466de44272012d44757972def08802d' 
  AND token = 'hMP0PzybMPuNUkR+m1Ya4apb8r/Q1StkFtDJ2KVKDEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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