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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d32045892194cb2ba68d94ccdb0bdc29c861fad4279d80f1bfa309cf94e416' 
  AND token = 'P8vm/IJakGyhvwMVEpk1TyfXTQnuV6x7C//00g1eNo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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