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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c00e37e846152222c4708d2b67bb32e8ebf2e777cb1c234a58e36ad0fcc2e8e' 
  AND token = 'HbA6QtBQK5D6RTjWU7UAc05GRZMsGQbTxONTnNoajWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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