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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4b066dfd07abdea81b8379e980518fc7c3ec02de30fd27009eea979128b162' 
  AND token = 'UQLoVckloLBNBM0OjxVBI7/3LurgtFwbIBQkbnr8gfk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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