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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5e6b553d3e937da5798c1df5ede5d09c37786aa5b3f48069ec310e43336021' 
  AND token = 'TQ22uofnuNgMOvh06UMau/CZCskzrfgVaeb1BfbcvbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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