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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '88a0dcf44707376e42a2a5702d6e0136569185b0cc5a0e916563d9778804c0a1' 
  AND token = 'mOUix1Au8OUg7fYsk4CY4RwjkCIkdE2bfHzo8ca4FQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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