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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dc454dfb38e8fcbc1a096c0b379a0707b3b2219865485aa4c2127f7eb6dd6a' 
  AND token = '027DLkA2FQfL/sALmbP6BbQ2NqLu64nDWF7SncNLoAM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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