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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f3c781049f14da2fd09cb837b32a3997556ceadc9b7bcc779c3286a71730e79' 
  AND token = 'VsAl1C09LOBdDLVgCs0gNZ7G/18Nf06EXQ/MX6vQxs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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