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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9baf860c414dd216e3840ac22865e0162312f665611c5ebe2a52923af8437ed' 
  AND token = 'ozZHzM5Em6p3CXItwiO7YK8kHwH1bHhaF8KZDgCoqbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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