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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2ca2d2457b2252fc9417371c86b3a564dcc89cd32161b037f70404366d1ac41' 
  AND token = '57CLLUKyS+ukUuIh66ZOkSAJKEQiIDsBFtFAHl5liWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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