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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8bf1f18ea3dd614868741fef90bfeeb3a0bbb4ffbc2effc4b8f68bdbc9b59a9e' 
  AND token = 'glN6V6/xkVvjMUNDtoVYHy5u9laY5HUNSVwYZ2GPO+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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