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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe871bbab43934dc3ed68d873ea1a9521a401ebf1d691d73309f2f28be16a27a' 
  AND token = 'DNRd6I01gAjB8KeZcMixYI3aGEsBVblAI1KSc9l0hUw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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