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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928d3238fff2a9cdaddf9d97a319157b4bc8d1bbdba6b9ddb2fe59e66a0f1cf6' 
  AND token = '8ZzOF6h33INeveq72iol164IaDXsEIrS4EtY2Q8NtwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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