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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e20663d5503e2cd73aa282c0ea3d5009c798b7bb38449968f68440700816a5c' 
  AND token = 'tXnMagY+fx1n30wd6UCZ4kO45sImibTq1HB/QaDkJmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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