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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '621c4f6f2d93f95434f0ef7428c25c635ffc71fafcd6e5dc75c447174f4e9b12' 
  AND token = 'pjFWdkG89dgTrGHNja5iVi7pUR+1gnVlm02r+bDMg6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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