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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6154bb92e81cee0e1e9c0033cc08bcd1f01fcd564360a03bf808a0f49c0ed279' 
  AND token = 'T2zmbfBfyr5+4wuxEeAy8L9gO746MUtOF9y9w1xfpb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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