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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ade975fc6bc620a69e258ae29533142f31d5491fa3810333d0c5605f6fa591a' 
  AND token = 'ezBa8ldbdQJxMcD0N5u5PefCxu4ePAumcXYzEQHE0WQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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