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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a86db78c699d006135ab34587eb8eb771df3c59fbd21198bc2a0151a2ef8b03e' 
  AND token = 'I0nNGsDQSlhgvYIgedmSQYmkdn9ckGFruNKnL01qiGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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