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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f97f2bc539d597cb33dba89a49136c89ff2385bc8fb6e3adef7e441c8e4905b7' 
  AND token = '6C4s87y/7RbvNC/It/l3DmryR271YYNX56lJw9Qo0LU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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