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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c32904d55df2d03d4cdb47f2437b676387345b4dfa8417630e76359b1efde2a' 
  AND token = 'wlKCesFr0v0ekUYJvjvLwTF8F6/YSCjZZ08H82xSSFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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