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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86d37dd0d87b848627bbe580759f7e50be77a9edd57c5ef4747941c763f3fd98' 
  AND token = 'u3hrIf7OFSGCZuNuJcL6dfVTpXWnlJ7t/X3MEPDdoHk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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