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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddea2099bb794a4ca1b7009a0b83d9d28049a14a27015822e8a23b7b10e799ec' 
  AND token = 'l+8JoesYEwQhla6LDmW48BK/OxEddaV/2Cfeyyoo+iE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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