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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a681f9ebf9c1e9544376a30bdd8dcb54812b0a67ca0fabb1ed51a0dcb24954b7' 
  AND token = 'GVs0f5hSfySMmuqN3/vcgrfW1lZNhOwoQ5Nv62nZo+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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