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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bae5c2e97337d4b8eed5e9df82b3748b753ccd10dcecbf9cfbce2532db457a1c' 
  AND token = '8319x0VN7EgcxVKZgdrveVoY3BDRP0gJnkqP2Z9niVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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