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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1405247102a01988c2bea32f8f3bf58effe570822b4ab30524268464cd73caed' 
  AND token = 'qYcHT7/uvXLV6OV+JaDW5vBLX4PEkT4kyJhbU7Ai9Bo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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