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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f66759d79072685601c6789f15dc9816a56922ee79d7d91951ed66d98e23943' 
  AND token = 'IWSyvASBI//Y3Ol8ow8JQlqBTgnI/IqDAu0EG5aMlBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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