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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e018fef65fcfbcf6241326c2307db851b383207719f64e81a2b491026dd160a2' 
  AND token = '3e3W4t827EFtg4bshgezPVM4o8d8TP4Io4aahht8K58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00124

JSON explain

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