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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75d6904abb82e1143efa54c3048d634a43bdd819c6083a8bc71d3cd2d7ed9798' 
  AND token = 'q8kxNwdlVJL4Jm4eF2Uy17ck9d6533Kx6FjxpnkxHA4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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