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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cf68a7f611f07688c6fdce738746f8bf50755ffeb5edf07daf19444486cbdc' 
  AND token = 'pKnZnGREw2n2D82ZpjWuTpV4TZF8Td6C6Pgf3Lh0VnA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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