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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ee956184897456bb025ce510b34a490dd6434118ca4e68cc8adc2bd110383b1' 
  AND token = 'yXa4/Ximjyy8ygx1sKXY7BnB0FzGARHDbk/vvcjnaek=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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