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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0678c35625cced26cc290b2b270f8b7c1192275e7723266defbc0d3b66c180ea' 
  AND token = 'HeEgQ20Ax409MIg1Lkjal4weFLd+DJ8u4ZIl/crqNbI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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