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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cbbc7870c55b67c4071d9f283f5e7655581cc7f3da0d62a7a0f7621edb22ac79' 
  AND token = 'AC0vmLsQKnmT4XwAKRknN5fDGTUPpuHGBeV6t+BA25g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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