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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3dd761447051af2164d3482bc6bc7bbe073a87b8d2c3d6ad0bd91d2a4c477fb' 
  AND token = 'apVfjKbfOw5POmRi9K+s/ifzvL1F1Xuvr13iGLUKxIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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