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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087e137b7c7f6d83a5f417d43cf58f256279d1a55eae50d0ead809bf5ff7dc12' 
  AND token = 'JghBj6d2QwkE3bM9vny4oS236uiAUWOcrvHbl0NHyVM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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