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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abf60c349fa6805ec79cf7bc2a8d775859ff7871dcaa5e98b8e1bbe31697ee5' 
  AND token = 'BnTyHGbPT5aUnHJNZnGLn2dX4Dj0b+4NTCzxQt9+YnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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