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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f310d6eced794d40f6fa1fd7281427029a3ec9ab2766734af49473befc0402f9' 
  AND token = 'A/qVyN7ca6AIhNtz+ojwx/sN0ZHri/bsK9MJs0h+g5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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