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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e190f62911fcc30a1c89faef3a28d63cbbe6a3a2f6c8b94fb1900c8f75dda840' 
  AND token = 'zzxt2cdS0LfVSjYA5gCTkLtAVRCU9yyUiRbQC1I+Glg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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