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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1b1e269be00d1e4b43c7ffe620d95ebc7942b1d27325597953c563c343d341a' 
  AND token = 'F+qXigF6rPr/IhSt/O8CKuF15YpW1LSiI5YkeaXM24s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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