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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad88ac107500c568f865e841a467f41193950409658589f6db87a8d30cac6be1' 
  AND token = '4gpTWMA2n/AH/XKeXoIAuLNtVdVlT0LN7AABPUlPP04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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