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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edba86a710632f57145ad07fdfe101d86e4774ff31f061903ddd5f1ab6d3482a' 
  AND token = '6XhSBxMhJ8Fst4ze0SQHnTs/MG0ds7CDHnVebTUcM0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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