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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e632cd36bb40d90b6c8f9e9d3188f2cb2eedb6e39e5265a6579dd8054287e73' 
  AND token = 'v+SOEU9Pa+e7A6rtRLGCuM4KO7lOVoKBhZYM8fe8ddc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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