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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03c27f0e8a1863a551fbc7239f59dff474b854d7ce7f05e8fceb22da4a19cb9' 
  AND token = 'gBmd76S6kMOQN71LEmNU1noxzsyo79Lxl8BcZLTNDUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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