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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '744cec7ce2398b17957881794d1eab5ad7c57991d57166014455c56506accfa4' 
  AND token = 'C1uliNgPqcxCzJvtKdeIokDmMgRuEh4O64ybx8v7o/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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