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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f76e7817f56d4bd3decf7b6b223fd23cc310ca8750aec6a3580f383df3e44c6' 
  AND token = 'awBnDmuildl2Sv2uGhB4AZOl3aJzfjqwsmmltAg419s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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