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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2030fae7d71df5c3b23648ccbffc9e19650d858a9d29c9810d92cd1a6a7e7d8' 
  AND token = 'eN/Bc5dK/cd8U7JnmmVw3NtIlVS7kIoxyyJMpDNNIKg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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