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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '055747e70cc07507cfb15be68dcf7d05facec6f163d728c0580a21a6c8f6c3e5' 
  AND token = 't7vzy7LjcOkBTh1L99DrDFIz4o0Jxge0/gT+xPmfcaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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