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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8893ac561ff80fad7344323a854148370fc9d64417ae503893c1cf558873cff7' 
  AND token = 'WZ5f4CVXmg32f6r+zVUHXUsfn1MIz0IkFbXMvBFMrQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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