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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a9e3910113c60f23603fd7cfa94371f7d225a16b3dce29540893422fcaeef3' 
  AND token = 'mgxP5wT7pa1cR8dSVCZwglK7fyS4t0vokb1X6bksv3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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