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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '417800c7a54fcd143eaf7381a6eb9a2787a5a47e8af6e423b75f51fa3e47bbd6' 
  AND token = 'y/WbbdCBJp6IIS0Bpzbmd0cuDNvl1fyDid1lqv/bONA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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