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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ac044e47bb3cad73e39d041ab5eed77fefed88e9c0d2563ce77e6a0a5de2cf' 
  AND token = '+dc7LQ6T0brZ+XF2izmveFGPFPfn5hUIfJ878os84EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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