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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4330b32771dfdf3dfbf0a4e71b4819027cfcd403deb387ff56c1390df1d7c777' 
  AND token = '40xl9MXkY8ZxsQELWi0qKWVy6KklU8ZDtCel1Tjh41U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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