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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc780ae7c1017c0b4885c3533d30198d9b1dc2de59709118859282346495a87f' 
  AND token = '7TtuHbBx5uZxY/Wy57BR7SaLLAhkbDhOyoEYa3FH1T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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